* gcc-interface/ada-tree.h (DECL_RESTRICTED_ALIASING_P): New flag.
	* gcc-interface/decl.c (gnat_to_gnu_param): For parameters passed by
	reference but whose type isn't by-ref and whose mechanism hasn't been
	forced to by-ref, set the DECL_RESTRICTED_ALIASING_P flag directly on
	them instead of changing their type.
	* gcc-interface/trans.c (scan_rhs_r): New helper function.
	(independent_iterations_p): New predicate.
	(Loop_Statement_to_gnu): For a loop with an iteration scheme, set an
	ivdep pragma if the iterations are independent.

From-SVN: r228377